Canon VB-C300 Administrator's Manual page 32

System Design Concept
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Determining Required Hard Disk Capacity
Determine the required hard disk capacity as follows.
Determine the required number of Camera Servers and required video data size.
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Select the Image Quality of each Camera Server.
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The video quality improves in proportion to the set value, but the data volume also
becomes larger.
Determine the frame rate for recording video (i.e., the number of frames per
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second).
For general security purposes, 1 to 2 fps is common. Higher frame rate requires
more hard disk space.
Determine the recording period per day and duration to retain data.
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After determining the conditions above, calculate the required hard disk capacity due
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to the video data size (in KB). Refer to "Example of frame sizes with VB-C60",
"Example of frame sizes with VB-C300" and "Example of frame sizes with VB-C50i"
(➝ P. 33).
If you record audio, to calculate the amount of hard disk space required for the audio
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data. The data size for recording audio is 8 KB/s regardless of the type of Camera
Server.
When determining hard disk sizes it is important to take into account that there needs to be
considered about 10 to 20% additional room.
Example 1: JPEG recording
- Using 16 Camera Servers (VB-C60) for recording,
- With each camera set to Medium Size for video data size and Image Quality set to 50
(data size per 1 frame: 15KB),
- Recording frame rate is set at 2 fps, and
- Data size per second is approximately 30 KB (= 15 KB x 2fps).
Although actual data size depends on objects shot by each Camera Server, this
calculation assumes the typical size shown above.
- Audio recording as also performed simultaneously on 2 of the Camera Servers.
For the above configuration, when JPEG images from 16 camera servers are being
recorded continuously at 2 frames per second all day, every day, the required hard disk
space is approximately 40GB per day (=30KB x 16 cameras x 60 seconds x 60 minutes x
24 hours = 41472000KB per day).
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